package com.hit.basmath.learn.others;

import java.util.ArrayList;
import java.util.List;

/**
 * 228. Summary Ranges
 * <p>
 * Given a sorted integer array without duplicates, return the summary of its ranges.
 * <p>
 * Example 1:
 * <p>
 * Input:  [0,1,2,4,5,7]
 * Output: ["0->2","4->5","7"]
 * Explanation: 0,1,2 form a continuous range; 4,5 form a continuous range.
 * <p>
 * Example 2:
 * <p>
 * Input:  [0,2,3,4,6,8,9]
 * Output: ["0","2->4","6","8->9"]
 * Explanation: 2,3,4 form a continuous range; 8,9 form a continuous range.
 */
public class _228 {
    public List<String> summaryRanges(int[] nums) {
        List<String> list = new ArrayList();
        if (nums.length == 1) {
            list.add(nums[0] + "");
            return list;
        }
        for (int i = 0; i < nums.length; i++) {
            int a = nums[i];
            while (i + 1 < nums.length && (nums[i + 1] - nums[i]) == 1) {
                i++;
            }
            if (a != nums[i]) {
                list.add(a + "->" + nums[i]);
            } else {
                list.add(a + "");
            }
        }
        return list;
    }
}
